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AI-RETAIL3
AI-OVERCROWD
Environment conditions
The position of the camera and the environmental conditions affect the performance of the application.
Performance is best under the following conditions:
n The image must not present flickering, severe noise or artifacts.
n Image must have a resolution of 640x360, 640x480, 320x180, 320x240.
n Rotating (PTZ) security cameras are supported only if they are not moved when the application is
enabled. If the camera is moved, the application must be reconfigured.
n Absence of occlusions (E. g. Trees, pillars, buildings, furniture elements etc.) that do not allow to see
the people.
n Absence of conditions of high crowding or stopped people that do not allow to count the individuals.
n Absence of stationary or slow-moving people for long periods in the counting area (e.g. Sales people
that encourage customers to enter).
n There must be no other moving objects whose appearance is similar to the people in the areas of
interest.
n Camera lens must not be dirty, wet or covered in rain or water drops. Camera lens must not be
steamy.
n Absence of "waving objects" (e.g. Meadow with tall grass, trees, sliding doors, etc.) or any other type
of disturbance that causes the continuous modification of the images (moving pixels) in the areas of
interest.
n Camera placement must be stable and solid in a way that wind or external disturbances of other types
will cause movement of the camera that appears on the image.
n Absence of vehicles with lights projected in areas of interest.
n Correct exposition of the camera: camera must not be in backlight, the framed area must not have
heterogeneous illumination, i.e. partially indoor or partially outdoor. In general, no areas to be
monitored must be almost white or almost black, i.e. the dynamic range must be sufficient to
correctly show detail of objects in the image. If necessary, the camera must be installed with external
illuminators that make it possible to distinguish the people in all natural or artificial lighting
conditions.
n The people must have a sufficient dissimilarity from the background, i.e. there is no explicit
camouflage, where the people are similar to the background in color and texture. Sufficient
dissimilarity means at least a color difference of at least 5% or a brightness difference of at least 10%.
n The people must have a minimum area of 200 pixels (e.g. 10x20, 5x40, ...).
n The floor must be a predominantly non-reflective surface.
n No hard lights must be present that cast shadows in a way that the background brightness is reduced
to less than 50% of the original value in the image.
96 / 153
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